Switch-operating mechanism



' Nov. 8, 1927. 1,648,553

A. F. C. LOTZ.

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ALFRED F. C. LO'IZ, OF CHICAGO, ILLINOIS, .laiSSIGNOR 'LO ELECTRICAL ENGINEERS EQUIPMENT COMIPANY, OF CHICAGO, ILLINOIS, Er CORPORATION OF ILLINOIS.

SWITCH-OPERATING MECHANISM.

. Application filed November 8, 1923. Serial No. 673,465.

My invention relates to mechanism for operating switches, more particularly to a device for closing an oil switch and for tripping the same open.

According to my invention I employ a rotary shaft which, in the preferred form of the invention, is the operating shaft of the switch and provide in conjunction therewith, means for automatically or manually tripping the switch open and for manually restoring the switch. to closed position. The same motion which restores the switch to closed position restores the automatic trip to normal position. v

The switch operating shaft moves through an angular motion of approximately while the manual reset or trip moves through approximately 90. The difference between these two motions is taken up by a yielding connection, preferably a spring, as will be more apparent from the following detailed description.

The mechanism employed according to my invention is of simple, rugged and inexpensive construction. The operating mechanism is characterized by a minimum of inertia so that the oil switch may open with great rapidity. Furthermore the strain upon the parts is low and long life and satisfactory operation are thereby assured.

In my copending application, (Case 5), Ser. No. 68 L278, filed January 4, 1924, I have shown a suitable oil switch employing a rocking or rotary shaft which is adapted to be operated by the present mechanism, but it will be understood that the invention is not limited to the combination of that palticular switch with the present mechanism,

but that the present mechanism is new 111' combination with any type of switch which employs a rocking or rotary shaft.

In order to acquaint those skilled in the art with the manner of constructing and operating my invention, I shall now, describe an embodiment of the same in conjunction with the accompanying drawings.

In the drawings:

Fig. 1 is an end elevational view of a trip and reset mechanism embodying my inven tion;

Fig. 2 is a front elevational viewof the same as viewed from the right of Figure 1;

Fig. 3 is a plan view of the same looking from above;

Fig.4: is a vertical sectional view taken on the line il of Fig. 2;

Fig. 5 is a similar section taken on the line 5-5 of Figure 2; r i i i Fig. 6 is a partial sectional view takenon the line 66 of Fig. 2 1 i 7 is a vertical longitudinal section taken on'the line 7-'7 of Fig. 6';

Fig 8 is a vertical sectional view taken to the plvot of the pawls and looking towards the operating mechanism on the 1'ine 8.;;-8: or Figure 6;

Fig. 9 is a horizontal sectional View taken to (ghe same pivot on the line 99 of Fig; 6; an.

Fig. 10 is a fragmentary sectional view taken on the line 1010 of Figure 6 to illus-- trate the manner of attachment ofth'e spring connecting theparts; i

Fig. 11' is a horizontal section taken on th line 11-11 of Fig. 1 to illustrate the automatic trip mechanism;

Fig. 1 2 is a vertical section to the automatic trip and reset mechanism taken on the line 12-12 of Figure 1;

Fig. 13 is a fragmentary sectional view of the reset mechanism for the automatic trip taken on the line 13'18 of Fig. 5.-

The square shaft 1 prolonged: forms the shaft of the switch mechanism such as disclosed in my copendingapplication above referred to. Rocking of this shaft through substantially 45 degrees serves to separate the contactsof said switch to the desired extent and movement of the same in the reverse direction closes the contacts. Thus by small rocking movement the switch is completely opened or closed. This shaft 1 has a stop member 2 clamped thereto by means of a yoke 3 and suitable bolts-4a The stop arm 52 engages either the stationary abutment 5 or the stationaryabutment 6 which are suitably mounted upon the main frame 7 by means of adjustable bolts 8 and 9.

It is to be particularly noted that the spring which operates the shaft 1 is contained within the switch as will be apparent from the d'awings of said co-pending application and is not shown in the present drawings. The spring which I shall describe later as connecting the two resetting parts is not operative to throw this sha-ft 1 for opening the switch. A suitable sheet metal case 10 is connected to the frame 7 and it houses the parts later to be described. The main frame member 7 is preferably a channel bar upon which the entire mechanism is mounted. A similar piece of channel bar 11 bent into L-shape extends down below the main frame member 7 and forms a supporting bracket for the automatic trip mechanism 12. The stop arm 2 has formed integral therewith, a semi-cylindrical portion 14 which extends axially along the main shaft 1 as will be apparent from the section of Fig. 7. This semi-cylindrical portion 14 has a groove formed therein as indicated at 15 and in said groove rests the tripping lever 16, the rear end of which is pivoted on the shaft 17 and the front end of which extends out at 18 to be engaged by the automatic trip mechanism later to be described. The intermediate portion of the lever 16 has an enlargement 19 which fits in the groove 15 and underlies the holding pawl or detent 20 which is mounted on the outer end of a swinging arm 21. This swinging arm is also mounted upon the shaft 17 mounted upon the main frame. The arm 21 is pinned to the shaft 17 as indicated at 22 so that the shaft and the arm move together for rotary motion. The shaft 17 is mounted in a pair of bearings 23 and'24 which are connected to the main frame member 7.

The groove 15 which is cut in the semior shoulder 28 adapted to be engaged by the detent of pawl 20 on the arm 21, and to be held against clockwise rotation as viewed in Figure 1, which is the direction of motion which the shaft 1 will take in opening the switch which is not shown. In other Words, the tension of the spring means in the switch tends to rotate the shaft in a clockwise direction. The pawl or detent 20 is wider than the flange 27 and it overhangs the enlargement 19 formed on the lever 16 so that if the lever 16 is swung upwardly the enlargement 19 engages the detent 20 and releases the shaft 1 from said detent so that the same may rotate in the counterclockwise direction to open the switch.

Now in order to restore the shaft 1 to its position as shown in Fig. 1 after it has been tripped, it is necessary to connect restoring mechanism to the shaft 1 for putting the spring of the oil switch under tension and holding the same in that position.

As shown in Fig. 1, I have provided an operating lever 30 which is pivoted at 31 to a stationary bracket for resetting the switch. This lever 30 has a bell crank arm 32 connected to a suitable operating rod 33 which extends vertically to the mechanism and through a yoke 34 is pivoted to an arm 35 mounted upon a rotary sleeve 36 which rotary sleeve is held between a collar 37 and stop arm 2 which is clamped on the shaft 1.

There are several intermediate parts between said sleeve 36 and stop arm 2, as will be apparent later. The rotary collar 36 is mounted upon a bearing sleeve 38 which has a rectangular opening thereto to rest upon the square shaft 1. This bearing sleeve 38 extends between the collar 37 and the adjafor mounting the hook bolt which hook bolt has a hooked inner end 46 engaging the end of the spring 43. The end of the spring is provided with a hook which embraces the hook end 46 of the bolt 45. end ofthe spring 43 has a similar hook 48 which engages the pin 49 which pin is mounted upon the flange 41 of the clutch member 40.

The outer flange of the housing 42 bears a stop arm 50 which extends axially along the shaft 1 and normally engages a cooperating arm 51 which extends out radially from the clutch member 40. This arm 51 carries a pivot pin 52 for the clutch pawl 53 which has a nose or detent 54 riding along the flange 26 and adapted to engage in'the notch or shoulder 55 on said flange 26of the stop arm member. This detent or catch 54 extends axially or longitudinally of the shaft 1 in each direction, the part 57 overrunning the enlargement 19 on the trip arm 16 and the part 56 overlying the flange 41 of the The opposite lUU clutch member 40 and also extending further and overlying a. part of the housing 42. The periphery of the housing 42 has a depressed portion 58 extending along the full axial length of the housing flange and defined at one end by the shoulder 59. The opposite end of said depressed portion is limited by a shoulder extending along the width of the face of said housing flange 42 only so far as the portion 56 of the catch or detent 54 extends. This shoulder 60 when it is thrust under the portion 56 of catch 54 tends to tip outsaid catch 54 from engagement with the shoulder 55 on the flange 26 of the stop member 2. The other part of the depressed portion 58 extends on up to a shoulder 61 which lies at substantially degrees from the position of the shoulder 59. Thus the one part of the depressed portion lies between shoulders 59 and 60 whichare spaced substantially 45 degrees apart and the other part of the depression 58 lies between shoulders 59 and 61 which are substantially 90 degrees apart.

The spring 43 tends to hold the stop arm 50 and the arm 51 of the clutch member in contact with each other so that these parts travel together as one unit until the'clutch member 40 is stopped whereupon further mo tion of the collar 36 and its stop arm 50 proceeds through tensioning of the spring 43. Now it will perhaps be well to describe the operation of this setting and trip mechanism which operates manually, before proceeding to a detailed description of the parts of the automatic trip mechanism and reset therefor.

Now assume that the parts are in the condition shown in Fig. l the handle 30 is in its uppermost position, the rod 33 is also in its uppermost position, the shaft 1 is in positio n to tension the spring in the oil switch which tends to move said shaft 1 in a clockwise direction. The stop arm 2 lies in its furthest counterclockwise position. The shaft 1 is heldthrough the stop arm member 1 1 whichhas a shoulder 28 on the flange 27 held by the nose of the pawl 21 which pawl is pinned on a shaft. 17 upon the stationary frame 7.

The trip lever 16 has its enlarged portion 19 underlying the nose 20' so that if now said trip lever 16 be moved upwardly to disengage the nose 20 from the shoulder or notch 28 the spring which tends to drive the shaft 1 inac'lock wise direction will be free to do so with the result that the stop arm 2 swings up against the stop 6 which limits its movement. No other parts'are at this time actuated. The shaft 1 then assumes the position shown in Figure 4.

Now in order to reset the switch that is to close the switch, the handle lever 30 is first swung downwardly through substantially 180 degrees. This lowers the rod 33 and pulls down the arm 35 swinging the collar 36 around through 90 degrees. This ratio of angular movements may be varied, but I find it to be highly advantageous and consider it a novel feature of my invention. When the collar 36 is swung clockwise as viewed in Fig. 1 the clutch member 40 is moved in the same direction because the arm underlies the arm 51 on said clutch mem her and compels the same to move with the collar 36. Hence the clutch pawl 53 rides around the periphery of the flange 26 up to a point where its detent 54; catches on the shoulder 55 on said flange 26 which engagement occurs at substantially the extreme end of the clockwise movement of the collar 36 and the clutch member 10. It is to be noticed that the shoulder or notch .55 is in line with the shoulder or notch 28 on the adjacent collar or flange 27. The clutch pawl 53 having moved up into the dotted line position shown in Fig. 4 and having caught its shoulder 56, lies in such position with respect to the depression 58 on the housing flange -12 as to be between the shoulders 59, and 60. These shoulders 59 and 60 move with the clutch collar 40 in its clockwise movement and have no effect upon the said pawl 53 at this time.

This is because in the clockwise movement of the collar its stop arm 50' engages the extension 51 on collar 40, and the two parts move together as though they were rigidly secured together.

Now, the operating arm 30 is swung upwardly and the collar 36 is rotated in a counterclockwise direction as viewed in Fig. 1. Since the nose 54: of the pawl 53 has caught in notch 55 counterclockwise movement of this pawl brings the stop arm member 1a with its arm 2 and shaft 1 around in the counterclockwise direction to close the main contacts of the switch. The first 415 degrees of movement of the operating sleeve occurs with the stop arm 50 and the radial extension5l in contact, the spring 43 being of sullicient tension to reset the main contacts of the switch against its operating spring. 'As soon as said reset position has been attained, the holding pawl 21 has the hatch or nose 20 thereof dropped into engagement with the shoulder 28 on said stop arm member 14 for holding the switch in closed positron. The further movement of the sleeve 36 in the counterclockwise direction is permitted by tensioning of the spring As said pawl 53 still holds its engagement with notch 55, the pawl 53 cannot move and this holds the further movement of the sleeve 36 tensions the spring 4:3 and this further movement brings the shoulder'tjO. under the nose 5 1 of the detent 53 tripping it out of the notch 55 so that said parts so and 36 may againtravel together through the next part of the movement which is substantially 45 degrees.

The switch may be opened manually by operation of the handle 30 through the following mechanism:

It will be noted that the holding pawl 21 1S pinned to the shaft 17 so that the two move together. A tripping arm 63, which is of the same size and shape as the pawl or detentarm, 21, is also pinned, as indicated at 62, to said shalt 17 so that said arms 63 and 21 move together "in unison. While this arm 63 has a nose or hook on the front end, it does not serve as a detent, but serves merely as a cam linger for engaging the shoulder59 upon the periphery of the housing drum 42.

Assume that the parts are in the'position shown in Fig. 1 and that the switch is closed, the switch may be opened manually by lowering of the operating handle 30 and connectedparts. When the operating handle is lowered manually, the sleeve 36 is rotated in a clockwise direction throughsubstantially 90 degrees, and at the end of the movement the shoulder 59 comes into engagement with the nose 64: of said trip arm 63, forcing the trip arm to rise and at the same time throwing the pawl 21 upward and disengaging its hook or detent 20 from the shoulder 28 to part 40. Consequently,

permit the shaft land connected parts to swing in a clockwise direction, opening the main switch and bringing the stop arm 2 against its cooperating stop member 6.

Closing of the switch may then be accomplished by throwing the operating handle upwardly, as previously described.

I shall now describe the automatic trip mechanism for tripping the, pawl 21 out of engagement with the notch 28 to permit the switch to open as is desired for overloads or for remote control and the manual reset which controls the same.

The automatic tripping mechanism 12 is mounted upon the bracket 11, as previously noted, and it comprises a frame member 65 bolted to the bracket 11. This frame member 65 provides a flattable with an opening 66 therein. Adjacent the edges of the openings there are mounted two bracket members 67 and 68 for supporting a rocking shaft 69 upon which are mounted two arms 70 and 71 ofva pantograph or toggle mechanism. A suitable collar or sleeve 72 is mounted on a shaft 69 between the brackets 67 and said pantograph arms 70 and 71. At their upper ends these pantograph arms 70 and 71 are pivoted at 7 3 and 74 to two additional pantograph arms 75 and 76, and these arms in turn are pivoted together at their upper, ends at the pivot 77.

The arm 7 6 extends past the pivot 7 1 to form a lower operating arm 7 8 and at its lower extremity is in turn pivoted upon a spring actuated operating lever 79. This spring actuated operating arm and the operating lever 79 is pivoted at its upper end on pivot 80 to the operating arm 7 8 of the pantograph mechanism and at its extreme lower end is connected to the tension spring 81, which tension spring is connected to an adjustable bolt 82 fastened to the depending flange of the frame member 65. The lever 7 8 is pivoted at 84: upon a downwardly extending portion of the bracket member 68. The lever 79 is made in duplicate parts to increase the strength of the same and to balance the mounting.

The pantograph mechanism is adapted to be held collapsed by a detent 86 pivoted on the shaft 69 and adapted to engage the upper corner 88 of the pantograph arm 7 The detent 86 is mounted upon an arm 89 hearing the magnet armature 90. The cross bar 90 extends across the three solenoid members 91, 92 and 93, which solenoids are mounted upon a suitable sub-base 94- on the frame member or base 65. These magnets each have suitable shells 95, as indicated in the sectional view of Fig.5, and comprise suitable windings 96 and a movable core or plunger 97 having operating stems 98 and heads 99, which heads underlie the cross bar 90. Terminals for the solenoids are suitably mounted, indicated at 100, upon stems may, if desired, be connected to dash pot mechanisms or other time element devices.

ne operation of the automatic tripping mechanism is as follows:- Assume that the parts are in the position shown in Fig. 1, the detent 86 holdingthe pantograph mechanism in collapsed or downward position. Assumethat the solenoids 91, 92 and 93 are energized. The corresponding plungers 97 will be raised, raising the trip arm 89 and releasing the detent 86, whereupon, under the influence of the spring 81 the operating lever 79 swings about its pivot 81 in a counterclockwise direction, viewed in Figs. 1, 4 and. 5, throwing the pantograph arms upwardly to cause them to strike the enlarged end 18 of the trip lever 16, as shown in full lines in Fig. 4. This upward movement of the trip lever 16 causes the enlarged part 19 to throw the detent 20 of the arm 16 out of engagement with the notch 28, permitting the switch to be opened by the action of its own spring and causing the stop arm 2 to rise up and engage the stop 6 by rotational movement ofthe square shaft 1.

The resetting mechanism for the automatic trip is connected so that manual clos ing of the switch is accompanied by resetting of the trip mechanism automatically. The resetting sleeve 36 has an arm'1 05 pivoted at 106 to the two side members of a link 107 which link 107 connected to an operat ing arm 108 of a bell crank lever 109 mounted on a rock shaft 110 which has its bearings in the base or frame member 65 of the automatic trip mechanism. The lever 109 is keyed to said shaft 110 as by means of a set screw 111, so that the arm 108, shaft 110 and arm 109 forms in elfect, a bell crank lever. V

The arm 109 has at its outer end an adjusting screw 112which is adapted to be set in any predetermined position as by means of the lock nut 113.

A loosely mounted resetting arm 114 is mounted on the shaft 110 adjacent the arm It can now be ing arm 79 of the pantograph mechanism for resetting the same. If the pantograph mechanism is set and not tripped out, the movement of the resetting device does not in anywise interfere therewiih. In a similar manner, the switch closing mechanism, after it is once finally set in position, does not interfere with the automatictrip mechanism.

Assuming that the switch mechanism is set and the automatic mechanism is operated, the solenoid plunger-s 97 trip out the detent 86 and the pantograph mechanism, under the influence of spring 81 strikes the foot 18 of the trip lever 16, throwing out the tie tent 20 from the shoulder 28 and permitting the square shaft 1 to rotate in a clockwise direction. The switch thus remains open until it is manually closed. To close the switch, the handle 30 is first swung downwardly 180 degrees and this motion rocks the shaft 110 and brings the resetting pin 115 against the arm 7 9 collapsing the pantograph mechanism and causing the detent 86 to catch and hold the same. Thereafter, on the return movement of the handle 30 the operating pawl 53 catches on the shoulder 55, swinging the switch mechanism to closed position and then later tripping out the resetting pawl 53, since the normal holding pawl 20-21 has engaged its shoulder 28 and the succeeding movement of the resetting sleeve 36 is completed without further disturbance.

The manual opening of the switch may be performed [as previously indicated with out interfering with the pantograph mechanism, if the same is set. If the pantograph mechanism is not properly reset, the switch will immediately fly open, since the detent 20-;21 cannot catch the shoulder 28 if the arm 16 is held up by the pantograph mechanism;

The pantograph mechanism is peculiarly adapted to the work of throwing out the trip lever 16 because it attains a high velocity and relatively great impact with light moving parts, and furthermore, when it is extended, as shown in Fig. 4, it ofiers a very substantial resistance to its collapse bypressure of the arm 16. In other words, it forms a toggle when extended, and the last part of its motion is therefore very powerful.

I do not intend to be limited to the details shown or described.

I claim 1. In combination, a rock shaft adapted to have set position and an unset position, a ratchet member secured to said shaft for holding and for actuating the'same, a relatively stationary pawl for engaging said ratchet to hold the shaft in its set position, a rocking sleeve on said shaft havlng a cam for tripping out said pawl. to permit the shaft to be moved to its unset position, said sleeve having a pawl adapted to engage said ratchet member on its return position and move it to its set position.

2. in combination, a shaft adapted to have a set position and an unset position, a stop for limiting the motion of said shaft, a ratchet member on said shaft, a relatively stationary pawl for engaging said ratchet to hold the shaft in its set position, a loose resetting and tripping sleeve mounted on the shaft, said sleeve having cam means for tripping out said pawl, a second pawl mounted on said sleeve adapted to engage said ratchet upon the limit of its motion in one direction, and for restoring the shaft to set position by movement in the opposite direction.

3. In combination, an operating shaft having a set and an unset position, stop means for-limiting the movement of said shaft, a ratchet for the shaft, a pawl for engaging the ratchet to hold the shaft in set position, means for tripping out said pawl,.a resetting sleeve having rocking motion, a pawl member yieldingly connected to said resetting sleeve, said pawl member being adapted to engage the ratchet upon the limit of the rocking motion of the sleeve in one direc tion, a cam on said resetting sleeve for trip-' pin out said last named pawl after it has reset the shaft, and a spring for yieldingly connecting said second pawl and said resetting sleeve.

4:. In combination, a main shaft adapted to have a set position and an unset position,

stops for limiting the motion of said main shaft, pawl and ratchet mechanism for holding the shaft in its set position, a resetting sleeve for resetting the shaft, said resetting sleeve having a greater degree of angular motion than the main shaft, an arm for 210+ tuating said sleeve, an operating rod con nected to said arm and an operating handle connected to the rod, said operating handle being adapted to move through 180 degrees.

In combination, a shaft adapted to have a fixed range of rocking motion between a set position and an unset position, means for holding the shaft in set position, means for moving the shaft from set position to unset position, a resetting sleeve having pawl means for resetting the shaft, said sleeve havingagreater degree of angular motion than the shaft, an operating arm for the sleeve, an operating rod connected to the arm, an operating handle lever pivoted to the rod and having 180 degrees of movement for actuating the rod to the limit of its movement in either direction.

6. In combination, a main shaft having limited rocking motion between a set position and an unset position, a pawl and ratchet for holding the shaft in set osition, spring means for throwing the to unset position when released from the pawl, a

' resetting and trip sleeve having a cam for throwing out said pawl and having a resetting pawl for resetting the shaft, said latter pawl being connected to the sleeve by a spring connection, and a cam on said resetting sleeve for throwing out the second pawl when the main shaft is reset,

7. In combination, a main shaft, a ratchet member onsa-id shaft, said shaft having a limited motion between a set and an unset position, means for moving the shaft automatically. from the set position to the unset position, a-stationary pawl for engaging said ratchet for holding the shaft in the set to have motion independent of the. pawl in lid one direction, cam means for throwing the resetting pawl outof engagement with the ratchet when the first holding pawl has engaged the ratchet to hold the shaft in set position.

8. In combination, a main shaft, a ratchet memberon said shaft, said shaft having a limited motion between a set and an unset position, means for moving the shaft automatically from the set position to the unset position, a stationary pawl for engaging said ratchet for'holding the shaft in the-set position, said ratchet havinga groove, a tripping lever lying in said groove, said lever being adapted upon movement out of the grooveto disconnect said pawl from said ratchet, resetting mechanism for resetting said shaft, said resetting mechanism comprising a rocking sleeve having a greater degree of angular'motion than the motion of the main shaft, a resetting pawl adapted to engage the ratchet on the main shaft, a yielding connection between said pawl and the resettingsleeve for permitting the sleeve to have motion independent of the pawl in one 'directiomcam means forthrowing the resetting pawl out of engagement with the ratchet when the first holding pawl has en-. gaged the ratchet to hold the shaft in set position, automatic means for en a ing said tripping lever and tripping out said holding pawl, and automatic means actuated by resetting of the main shaft for resetting said automatic tripping mechanism. 9. In combination, a main shaft having a limited'rocking motion between a set position and an unset position, a. pawl and ratchet for holding the shaft in set position, a tripping lever for tripping out the pawl to permit the shaft to assume its unset position, a pantograph device, spring means for extending said pantograph device, an; electro magnetic means for releasing said pantograph device to operate said tripping lever.

'10. In combination, a main shaft having a limited rocking motion between a set position and an unset position, a pawl and ratchet for holding the shaft in set position, a tripping lever for tripping out the pawl to permit the shaft to assume its unset position, apantograph device, spring means for extending said pantograph device, an electro magnetic means for releasing said pantograph' device to operate said tripping lever, means for resetting the shaft, and automatic means controlled by said resetting means for resetting the pantograph tripping device. I p

11. In combination, a rocking shaft having a ratchet, a pawl for holding the ratchet, means for tripping out the pawl, toggle means for engagingsaid tripping member, an arm for extending said toggle means, a spring for actuating said arm, a detent for holding said toggle in collapsed position, and electro magnetic means for tripping out said detent. r

12. In combination, a rocking shaft having a ratchet, a pawl for holding the ratchet, means for tripping out the pawl, toggle means for engaging said tripping member, an arm for extending said toggle means, a.

' spring for. actuating said arm, a detent for.

holding said toggle in collapsed position,

and electro magnetic means for tripping out said detent, resetting means for resetting said shaft to bring the pawl and ratchet into engagement, and automatic means controlled by said resetting means for collapsing said toggle and bringing the, same into engagement with the detent means therefor.

13. Incombination, a main rocking shaft having limited angular motion between set and unset position, .a'ratchet on said shaft, a pawl for holding the ratchet, a tripping lever for tripping out said pawl, a tripping arm for tripping out said pawl, a resetting sleeve having a cam for engaging said trip ping armand having a resetting pawl adapted to engage the ratchet when the sleeve is moved to one extreme position, spring means connecting said resetting pawl and said resetting sleeve, cam means on the sleeve for engaging the resettingpawl to re? lease .the same from the ratchet whenthe shaft has been reset, automatic throw-out meansforsaid tripping lever, spring means for extending said automatic tripping mechanism to operate saidlevenand electromagnetically operated holding means for said last named means 14 In combination, a main rocking shaft having limited angular motion between set and unset position, a ratchet on said shaft, a pawl'for holding the ratchet, a tripping lever for tripping out. said pawl, a tripping arm for tripping out said pawl, a resetting sleeve having a cam for engaging said tripping arm and having a resetting pawl adapted to engage the ratchet when the sleeve is moved to one extreme position, spring means connecting said resetting pawl and said'i'esetting sleeve, cam means on the sleeve for engaging the resetting pawl to release the same from the ratchet when the shaft has been reset, automatic throw-out means for said tripping lever, spring means for extending said automatic tripping mechanism to operate said lever, and electromagnetically operated holding means for saidlast named means, and automatic resetting means actuated by motion of the resetting sleeve for resetting said throwout means.

15. In combination, a rock shaft having a limited angular motion between a set and an unset position, a ratchet member on said shaft, a pawl for engaging said ratchet memher for holding the shaft inset position, a

throw-out lever for throwing out said pawl, spring actuated throw-out mechanism having an extended position and a collapsed position, electromagnetically operated means for holding said throw-out means in collapsed position, a resetting'sleeve having greater angular motion than the motion of said main shaft, a resetting pawl controlled by the resetting sleeve, a spring connection between said resetting pawl and said sleeve for permitting independent motion of the sleeve with respect to the pawl, cam means for tripping out said resetting pawl, cam means on said sleeve for tripping out the llOlClillg pawl, automatic resetting means controlled by the resetting sleevefor resetting the throw-out means.

16. In combination, a rock shaft having a limited angular motion between a set and an unset position, a ratchet member on said shaft, a pawl for engaging said ratchet member for holding the shaft in set position, a. throw-out lever for throwing out said pawl, spring actuated throw-out mechanism having an extended position and a collapsed position, electromagnetically operated means for holding said throw-out means in collapsed position, a resetting sleeve having greater angular motion than the motion of said main shaft, a resetting pawl controlled by the resetting sleeve, a spring connection between said resetting pawl and said sleeve for permitting independent motion of the sleeve with respect to the pawl, cam means for tripping out said resetting pawl, cam means on said sleeve for trippingout the holding pawl, automatic resetting means controlled by the resetting sleeve for resetlever for throwing the operating rod, a bell.

crank intermediate said hand lever and operating rod forming a toggle connection therebetween, said hand lever having motion through 180 degrees for throwing the sleeve to the limit of its motion by a toggle action.

17. In combination, a main shaft having a rocking motion of substantially 45 degrees between a set and an unset position, pawl and ratchet means for holding the shaft in set position, a resetting sleeve adapted to move through substantially 90 degrees of motion, said resetting sleeve having a pawl and knock-out cam for resetting the shaft, an actuating arm for the setting sleeve, an operating rod connected to said arm, an actuating handle, a toggle connection between said operating rod and the actuating handle,

' said actuating handle having motion through 180 degrees and being adapted to toggle said rod. I

18. In combination, a main shaft having a limited degree of angular motion between iii a set and an unset position, a pawl and ratchet for holding the shaft in set position, a resetting sleeve having a resetting pawl and a knockout cam for resetting the main shaft, said sleeve having an angular motion greater than the angular motion of the main shaft, an operating arm for said resetting sleeve, an operating rod or link connected to said arm, anoperating handle lever adapted to move through 180 degrees of motion and forming with said rod a toggle at either limit of its movement.

19, In combination a shaft, a detent for holding the shaft, a tripping arm for releas ing the detent, toggle means for operating said arm comprising a pair of links pivoted together, means for guiding the upper end of one link, said one link being extended past the pivot point bet-ween the two, and a spring actuated arm pivoted to the lower end of said first named link.

20. In combination, a pantograph, an arm pivoted intermediate its ends and connected at one end and remote from its pivot to the pantograph for extending the same, a spring connected to the other end of the arm adjacent the pivot thereof and urging said arm in operating direction, means for holding the pantograph collapsed, and means for releasing said holding means. i

21. In combination, a rocking shaft having a ratchet, a pawl for holding the ratchet, means for tripping out the pawl, toggle means for engaging said tripping means, an arm for extending said toggle means connected thereto at its upper end and pivoted intermediate its ends, the connection between the pivot thereof urging the arm in operating direction about its pivot, means holding the toggle collapsed, and means for moving said holding means into inoperative position. 22. In combination, a pantograph, a de tent for holding the pantograph collapsed, means for releasing said detent, a lever connected to the end of one of the pantograph links for extending the pantograph with a high initial velocity, and means urging the lever in pantograph extending direction.

23. In combination, a movable element having a catch, pawl means engaging the catch, a toggle construction adapted to be extended to strike an element of the pawl means to release it, said toggle assuming a substantially locked position When extended, and means for resetting the movable element and for breaking the toggle to reset the same. 7 i

In Witness whereof, I hereunto subscribe my name this 6th day of November, 1923.

ALFRED F. o. LOTZ. 

